IB/mlx4: Use kzalloc() for new QPs so flags are initialized to 0

Current code uses kmalloc() and then just does a bitwise OR operation on
qp->flags in create_qp_common(), which means that qp->flags may
potentially have some unintended bits set.  This patch uses kzalloc()
and avoids further explicit clearing of structure members, which also
shrinks the code:

add/remove: 0/0 grow/shrink: 0/1 up/down: 0/-65 (-65)
function                                     old     new   delta
create_qp_common                            2024    1959     -65

Signed-off-by: Eli Cohen <eli@mellanox.co.il>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

diff --git a/drivers/infiniband/hw/mlx4/qp.c b/drivers/infiniband/hw/mlx4/qp.c
index 91590e7..89eb6cb 100644 (file)
--- a/drivers/infiniband/hw/mlx4/qp.c
+++ b/drivers/infiniband/hw/mlx4/qp.c
@@ -454,19 +454,8 @@ static int create_qp_common(struct mlx4_ib_dev *dev, struct ib_pd *pd,
        spin_lock_init(&qp->rq.lock);
 
        qp->state        = IB_QPS_RESET;
-       qp->atomic_rd_en = 0;
-       qp->resp_depth   = 0;
-
-       qp->rq.head         = 0;
-       qp->rq.tail         = 0;
-       qp->sq.head         = 0;
-       qp->sq.tail         = 0;
-       qp->sq_next_wqe     = 0;
-
        if (init_attr->sq_sig_type == IB_SIGNAL_ALL_WR)
                qp->sq_signal_bits = cpu_to_be32(MLX4_WQE_CTRL_CQ_UPDATE);
-       else
-               qp->sq_signal_bits = 0;
 
        err = set_rq_size(dev, &init_attr->cap, !!pd->uobject, !!init_attr->srq, qp);
        if (err)
@@ -704,7 +693,7 @@ struct ib_qp *mlx4_ib_create_qp(struct ib_pd *pd,
        case IB_QPT_UC:
        case IB_QPT_UD:
        {
-               qp = kmalloc(sizeof *qp, GFP_KERNEL);
+               qp = kzalloc(sizeof *qp, GFP_KERNEL);
                if (!qp)
                        return ERR_PTR(-ENOMEM);
 
@@ -725,7 +714,7 @@ struct ib_qp *mlx4_ib_create_qp(struct ib_pd *pd,
                if (pd->uobject)
                        return ERR_PTR(-EINVAL);
 
-               sqp = kmalloc(sizeof *sqp, GFP_KERNEL);
+               sqp = kzalloc(sizeof *sqp, GFP_KERNEL);
                if (!sqp)
                        return ERR_PTR(-ENOMEM);